JP3869432B2 - Ignition coil for internal combustion engine - Google Patents

Description

  The present invention relates to an ignition coil for an internal combustion engine that supplies a high voltage to generate a spark discharge, for example, in an ignition plug of an automobile engine.

  FIG. 3 is a longitudinal sectional view showing an example of a conventional ignition coil for an internal combustion engine. The symbols in the drawing will be briefly described. The primary coil that excites the center core 1 and the side core 2 by being wound around the outer periphery of the center core 1 and the side core 2 and the center core 1 that form a closed magnetic circuit. 3, the secondary coil 4 wound around the outer periphery of the primary coil 3, the insulating material 5 that insulates them, the case 6 in which these components are installed, and the high voltage induced by the secondary coil 4 is 2 The terminal 41 of the winding end of the next coil 4, the terminal 71 provided on the high voltage diode 7 for preventing backflow of high voltage for contact with the pin 41, the terminal 72 provided on the high voltage diode for contacting the spring 8, the spring High voltage is conducted to the spark plug via 8. A rubber 9, an adapter 30 and a boot 32 for insulating the spring 8 are shown.

  The high voltage diode 7 of the ignition coil is connected to the contact terminal 71 of the end pin 4l of the secondary coil 4 and the spring contact terminal 72 by soldering. A tube 73 responsible for press-fitting into and insulation between both terminals is provided.

  In the conventional technology, the contact structure of the high voltage diode 7 part is complicated, and there is a problem that it is not possible to cope with the abolition of solder in consideration of environmental contamination due to lead solder. In addition, there is a drawback that the cost is increased due to an increase in the number of parts and the number of work steps.

  The present invention has been proposed in view of the above, and provides an ignition coil for an internal combustion engine that is inexpensive and highly reliable by reducing the number of parts in the connection structure of a high-voltage diode and eliminating soldering. It is aimed.

  In order to achieve the above object, an ignition coil for an internal combustion engine according to the present invention includes a primary coil and a secondary coil, a center core passing through an inner periphery of the primary coil for magnetically coupling the two coils, and the A side iron core passing through the outer periphery of the secondary coil, the primary coil, the secondary coil, the center iron core, and the side iron core are housed in a housing case and embedded with an insulating material for insulating high voltage, In an ignition coil for an internal combustion engine that transmits a high voltage generated in a coil to a plug via a high voltage diode and a spring in a protector, the connection between the secondary coil and the high voltage diode, and the high voltage diode and the spring is connected to a lead terminal. It is characterized by a press-contact structure that is inserted or press-fitted in the axial direction.

  Further, in the invention according to claim 2, the pressure contact structure is such that a lead terminal extended from a high voltage diode is inserted or press-fitted into an opposing guide portion from the axial direction of the lead terminal. Features.

  According to a third aspect of the present invention, the secondary coil side guide portion includes an elastically biased secondary coil winding end pin and is extended from the high voltage diode by the winding end pin. The lead terminal is press-contacted.

  According to a fourth aspect of the present invention, a lead terminal holding portion for fixing a lead terminal of the high voltage diode is integrally formed in the housing case.

  Further, in the invention according to claim 5, a guide portion for inserting a lead terminal of a high voltage diode is integrally formed on the pin housing portion for ending winding of the secondary coil and the spring contact terminal, and the guide portion is formed on the guide portion. Is provided with a tapered insertion opening of 30 degrees or less.

  Further, in the invention according to claim 6, the high-voltage diode main body is fixed by being inserted or press-fitted into an engagement hole provided in the storage case, and the holding portion by the engagement hole is a high-voltage diode. It is deviated from the diode element built in the main body.

  Since this invention consists of an above-described structure, there can exist an effect which is demonstrated below.

  According to the first aspect of the present invention, the primary coil and the secondary coil, the center iron core that passes through the inner circumference of the primary coil that magnetically couples the two coils, and the side iron core that runs through the outer circumference of the secondary coil. The primary coil, the secondary coil, the center iron core, and the side iron core are housed in a housing case and embedded with an insulating material for insulating high voltage, and the high voltage generated by the secondary coil is a high-voltage diode. In addition, in the ignition coil for an internal combustion engine that transmits to the plug via the spring in the protector, the connection between the secondary coil and the high voltage diode, and the connection between the high voltage diode and the spring is inserted or pressed in from the axial direction of the lead terminal. Therefore, the number of parts can be reduced without impairing the reliability of conducting high-voltage current. Moreover, the influence on the environment can be improved by eliminating the soldering operation.

  In the invention according to claim 2, since the press contact structure is to insert or press-fit a lead terminal extending from the high-voltage diode into the opposed guide portion from the axial direction of the lead terminal. The process can be abolished.

  According to a third aspect of the present invention, the guide portion on the secondary coil side includes a winding end pin for the elastically biased secondary coil, and the lead terminal is extended from the high voltage diode by the winding end pin. Can be securely connected by simply inserting the lead terminal 22 through the opening 23. Therefore, soldering work is not required.

  In the invention according to claim 4, since the lead case holding part for fixing the lead terminal of the high voltage diode is integrally formed in the housing case, the lead terminal of the high voltage diode can be easily fixed in the housing case. Can do.

  In a fifth aspect of the present invention, a guide portion for inserting a lead terminal of a high-voltage diode is integrally formed on the pin housing portion for ending winding of the secondary coil and the spring contact terminal. Since the taper-shaped insertion opening of less than or equal to this is provided, the lead terminal of the high-voltage diode can be easily inserted or press-fitted.

  According to a sixth aspect of the present invention, the high-voltage diode body is fixed by being inserted or press-fitted into an engagement hole provided in the storage case, and a sandwiching portion by the engagement hole is attached to the high-voltage diode body. Since it deviates from the built-in diode element, there is no possibility of damaging the diode element by the holding portion.

  When the soldering part of the ignition coil for internal combustion engines is abolished and the number of parts is deleted by connecting with a press-contact structure that inserts or press-fits from the axial direction of the lead terminal into which the high-voltage diode and the secondary coil and spring are inserted or press-fitted The purpose can be achieved.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment. FIG. 1 is a longitudinal sectional view showing an example of an ignition coil for an internal combustion engine according to the present invention, and FIG. 2 is an enlarged sectional view of a main part of the ignition coil for an internal combustion engine according to the present invention. Here, the internal combustion engine ignition coil 10 includes a primary coil 11 and a secondary coil 12, and a center iron core 13 and the secondary coil that pass through the inner periphery of the primary coil 11 that magnetically couples the two coils. 12 and a side iron core 14 passing through the outer periphery of the coil 12. The primary coil, the secondary coil, the center iron core, and the side iron core are housed in a housing case 15 and embedded in an insulating material 16 for insulating high voltage. An ignition coil for an internal combustion engine that transmits a high voltage generated in the secondary coil 12 to a plug via a high voltage diode 17 and a spring 18 in the protector, the secondary coil 12 and the high voltage diode 17, and the high voltage diode 17 and the spring. The press contact structure is inserted or press-fit from the axial direction of the lead terminal.

  The pressure contact structure on the secondary coil 12 side includes a winding end pin accommodating portion 20, a winding end pin 21, an opening 23, and the like. A part of the secondary coil bobbin 19 is provided with an end-of-winding pin housing portion 20, and the end-of-winding pin 21 of the secondary coil 12 is spring-biased inside the end-of-winding pin housing portion 20. It is stored. Further, the end-of-winding pin accommodating portion 20 has an opening 23 for inserting a columnar lead terminal 22 extending from the high-voltage diode 17. The opening 23 is expanded outward at an angle of 30 degrees or less in a tapered shape.

  The housing case 15 has a lower end formed in a funnel shape, and a lead terminal holding portion 24 for holding the lead terminal 22 of the high-voltage diode 17 is erected on the inside thereof. A lead terminal guide portion 25 that guides the lead terminal 22 is integrally formed at a position facing the opening portion 23 inside the housing case 15.

  The end-of-winding pin accommodating portion 20 configured in this way is inserted or retracted after the end-of-winding pin 21 housed in a spring-biased state when the lead terminal 22 is inserted or press-fitted through the opening 23. The press-fitted lead terminal 22 is pressed. Therefore, the secondary coil 12 and the high voltage diode 17 can be electrically connected without soldering.

  At the lower end of the funnel portion of the housing case 15, an engagement hole 26 having a holding portion 27 that is partially narrowed for inserting or press-fitting the high-voltage diode 17 is formed. As shown in FIG. 2, the holding portion 27 is installed at a position shifted from the position of the diode element 17 a built in the high voltage diode 17. A fitting hole 29 for fitting a spring contact terminal 28 attached to the top of the spring 18 is formed at the lower end of the funnel portion of the housing case 15, and a step difference from the engagement hole 26 of the high voltage diode 17. It has a part and is continuous. Further, the spring contact terminal 28 is formed with a tapered guide hole 30 on the side facing the high voltage diode 17, and is configured to fit a lead terminal 22 extending downward from the high voltage diode 17. Yes. The taper angle of the guide hole 30 is set to approximately 30 degrees or less. Therefore, the contact of the spring contact terminal 28 and the high voltage diode 17 can be ensured by the pressure contact structure only by mounting the spring 18 from below the high voltage diode 17 fitted to the holding portion 27.

  In the internal combustion engine ignition coil 10 configured as described above, the connection between the winding end pin 21 of the secondary coil 12 and the high voltage diode 17 and the connection between the high voltage diode 17 and the spring 18 are respectively inserted from the axial direction of the lead terminal. Or since it is connected by the press-contact structure which press-fits, it can manufacture without performing a soldering process. Here, the press-contact structure means that both are electrically connected by insertion or press-fitting.

FIG. 1 is a longitudinal sectional view showing an example of an ignition coil for an internal combustion engine according to the present invention. FIG. 2 is an enlarged sectional view of a main part of the ignition coil for the internal combustion engine. FIG. 3 is a longitudinal sectional view showing an example of a conventional ignition coil for an internal combustion engine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ignition coil 11 for internal combustion engines Primary coil 12 Secondary coil 13 Center iron core 14 Side iron core 15 Housing | casing case 16 Insulation material 17 High voltage diode 17a Diode element 18 Spring 19 Secondary coil bobbin 20 Ending pin accommodating part 21 Ending pin 22 Lead terminal 23 Opening 24 Lead terminal holding part 25 Lead terminal guide part 26 Engaging hole 27 Nipping part 28 Spring contact terminal 29 Fitting hole 30 Guide hole 31 Adapter 32 Boot

Claims (6)

A primary coil and a secondary coil; a center iron core that passes through an inner circumference of the primary coil that magnetically couples the two coils; and a side iron core that passes through the outer circumference of the secondary coil; The secondary coil, center iron core and side iron core are housed in a housing case and embedded with an insulating material for insulating high voltage, and the high voltage generated in the secondary coil is plugged through a high voltage diode and a spring in the protector. In the internal combustion engine ignition coil that transmits to
An ignition coil for an internal combustion engine, characterized in that the connection between the secondary coil and the high voltage diode, and the connection between the high voltage diode and the spring is inserted or pressed in from the axial direction of the lead terminal.   2. The internal combustion engine ignition according to claim 1, wherein the press-contact structure is configured to insert or press-fit a lead terminal extending from the high-voltage diode into a guide portion arranged opposite to the lead terminal in an axial direction of the lead terminal. coil.   The guide portion on the secondary coil side includes a winding end pin of an elastically biased secondary coil, and a lead terminal extending from a high voltage diode is pressed by the winding end pin. Item 3. An ignition coil for an internal combustion engine according to Item 2.   The ignition coil for an internal combustion engine according to any one of claims 1 to 3, wherein a lead terminal holding portion for fixing a lead terminal of the high voltage diode is integrally formed in the housing case.   A guide part for inserting a lead terminal of a high-voltage diode is integrally formed on the pin housing part for winding end of the secondary coil and the terminal for spring contact, and the guide part has a tapered insertion opening of 30 degrees or less. The ignition coil for an internal combustion engine according to claim 1, wherein the ignition coil is provided.   The high-voltage diode body is fixed by being inserted or press-fitted into an engagement hole provided in the storage case, and a sandwiching portion by the engagement hole is deviated from a diode element built in the high-voltage diode body. The ignition coil for an internal combustion engine according to any one of claims 1 to 5, wherein

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